cpu/intel/haswell: Remove unused 'include <cpu/x86/bist.h>'

Change-Id: I5156eb97648927e5fe6e467abb8e3e055a231fec
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41686
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/cpu/intel/haswell/romstage.c

@@ -2,7 +2,6 @@
 
 #include <console/console.h>
 #include <cf9_reset.h>
-#include <cpu/x86/bist.h>
 #include <timestamp.h>
 #include <cpu/x86/lapic.h>
 #include <cbmem.h>